The dielectric response of a colloidal spheroid

Chassagne, Claire; Bedeaux, Dick

doi:10.1016/j.jcis.2008.06.055

Cited by 32 publications

(63 citation statements)

References 18 publications

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“…This theory is derived using the same set of equations and using the same assumptions that were used for the derivation of the analytical theory for the dielectric response presented in [15]. Using this new formula for electrophoresis and the formula for dielectric spectroscopy presented in [15], we will confirm Rowlands and O'Brien's findings regarding kaolinite (i.e., the electrokinetic response of kaolinite cannot be fitted without the inclusion of a Stern layer conductance). This has strong implications for the interpretation of the electrophoretic mobility data of kaolinite (and clays in general).…”

Section: Introductionsupporting

confidence: 57%

Electrokinetic study of kaolinite suspensions

Chassagne

Mietta

Winterwerp

2009

Journal of Colloid and Interface Science

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Section: Introductionsupporting

confidence: 57%

Electrokinetic study of kaolinite suspensions

Chassagne

Mietta

Winterwerp

2009

Journal of Colloid and Interface Science

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“…The set (13,15,16,17) of equations and boundary conditions describe electrode polarization within the Debye-H€ uckel approximation for 1-1 electrolytes.…”

Section: This Journal Is ª the Royal Society Of Chemistry 2010mentioning

confidence: 99%

“…The solution of eqn (13,15,16,17) for the free charge density can be written as, r(z,t) ¼ E 0 [R 0 (z) cos(ut) + R 00 (z) sin(ut)]…”

Section: B the Analytical Form Of The Free Charge Density And Potentialmentioning

confidence: 99%

Electric-field induced transitions in suspensions of charged colloidal rods

Kang

Dhont

2010

Soft Matter

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We explore transitions in suspensions of fd virus at a low ionic strength, induced by external electric fields at frequencies where double layers are polarized. On the basis of the different optical morphologies, phase/state diagrams are constructed in the field-amplitude versus frequency plane and the field-amplitude versus concentration plane. Due to interactions between polarized double layers, for low frequencies, various phases and dynamical states are found: a nematic phase, a striped phase and a dynamical state where nematic domains melt and reform. At relatively high frequencies of a few kHz, a uniform homeotropic phase is induced. The various phases and states are characterized by means of polarization microscopy, birefringence, dynamic light scattering and video-correlation spectroscopy. An expression is derived for the attenuation of the electric field due to electrode polarization, which is tested experimentally. This theory is used to correct phase/state diagrams for electrode polarization.

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“…Elongated nanoparticles are modeled as spheroids [Chassagne and Bedeaux, 2008]. The aspect ratio (a r ) of the inclusion is defined as the ratio of the nanoparticle's length (l) and diameter (d), that is, the ratio of the long and short axis dimensions for the spheroid.…”

Section: Dielectric Propertiesmentioning

confidence: 99%

Comparison of complex permittivities of isotonic colloids containing single‐wall carbon nanotubes of varying chirality

Nair

Symanowski

Gach

2011

Bioelectromagnetics

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The application of bio-compatible, conductive nanoparticles in combination with radiofrequency (RF) irradiation to raise tissue temperatures between 40 and 60 °C for hyperthermia and ablation spurred interest in the complex permittivities of isotonic nanoparticle-based colloids. Nanoparticles with large aspect ratios and high permittivities increase the bulk permittivity of the colloid and RF losses at the macroscopic scale. The complex permittivities of isotonic colloids with and without single-wall carbon nanotubes (SWCNTs) containing either metallic, semiconducting, or mixed chiralities were measured from 20 MHz to 1 GHz at room temperature. The colloids were made with one of three different isotonic solvents: phosphate buffered saline (PBS), and Dulbecco's modified eagle medium (DMEM) with and without 0.5% weight/volume bovine serum albumin to simulate cytosol and blood, respectively. The concentration of elemental carbon from the SWCNTs in the colloids ranged from 16 to 17 mM. The permittivities were corrected for electrode polarization effects by fitting the data to the Cole-Cole relaxation model with a constant phase angle element. The presence of SWCNTs increased both the real and imaginary components of the permittivities of the colloids. For all three solvents, the direct current (DC) components of the real and imaginary permittivities were greatest for the colloids containing the mixed chirality SWCNTs, followed by the colloids with semiconducting SWCNTs, and then metallic SWCNTs.

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The dielectric response of a colloidal spheroid

Cited by 32 publications

References 18 publications

Electrokinetic study of kaolinite suspensions

Electrokinetic study of kaolinite suspensions

Electric-field induced transitions in suspensions of charged colloidal rods

Comparison of complex permittivities of isotonic colloids containing single‐wall carbon nanotubes of varying chirality

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